Reply to "centreforce clutch release bearing"

There are several grades of Centerforce diaphragm clutches. Some are extremely stiff- I do NOT recommend their heavy-duty clutch for street use in any Pantera unless you're racing at LeMans, and I don't have a current parts book handy. The redrilling mentioned is due to Centerforce often supplying longer bolts one thread size larger than stock, to be used with small stand-offs that they also supply with their clutches. Using stock bolts on such a clutch cover means the holes in the new clutch cover may be oversized, so substituting stock bolts will quickly work loose. They do use the same bolt pattern as stock; other brands do not.

Drilling a stock grey iron flywheel, then rethreading to a new size can very easily be done wrong resulting in a destructive explosion, whether you're changing patterns or enlarging an existing one. Maybe with some street pressure plates, Centerforce has stopped supplying the oversized bolts. Did yours come with mounting hardware & instructions? They do (or at one time, did) have a good Tech Support telephone line.